Trending Square D QO3401021 – 40A 3 Pole Miniature Circuit Breaker

Part of the QO series, the Square D QO340-1021 is a 40-amp, three-pole miniature circuit breaker designed for residential, commercial, and industrial use. It is engineered to mount into QO load centers, NQ panelboards, and legacy NQOD systems. This plug-on breaker features a 10kAIC rating at 240VAC and utilizes thermal-magnetic trip technology. The defining feature is the factory-installed 120/240V shunt trip accessory, which enables the breaker to be tripped remotely from a pilot device.